Fix bug introduced in last checkin due to CastInst not being visible

llvm-svn: 3327
diff --git a/llvm/lib/Transforms/Scalar/GCSE.cpp b/llvm/lib/Transforms/Scalar/GCSE.cpp
index a99a502..2f1be3b 100644
--- a/llvm/lib/Transforms/Scalar/GCSE.cpp
+++ b/llvm/lib/Transforms/Scalar/GCSE.cpp
@@ -253,7 +253,8 @@
 //
 //===----------------------------------------------------------------------===//
 
-bool GCSE::visitCastInst(CastInst &I) {
+bool GCSE::visitCastInst(CastInst &CI) {
+  Instruction &I = (Instruction&)CI;
   Value *Op = I.getOperand(0);
   Function *F = I.getParent()->getParent();